2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt PROBLEM SOLVING ESTIMATING MULTIPLY 2-DIGIT FACTORS MULTIPLY MONEY MULTIPLY REALLY BIG NUMBERS

Marty plans to deposit $4.50 into his bank account each week. Estimate to see if he will have saved $50 to pay for a computer game at the end of 21 weeks.

You should underestimate. $4 x 20 (or 21). He will have enough.

Larry is in a bike race. There are 12 bikes in each row. There are 4 rows in front of him and 8 rows behind him. How many racers are there in all?

156 racers

Billy Bob needs to buy 5 notebooks. Each notebook costs $1.75. Estimate to see how much money he needs to give to the clerk. Should you overestimate or underestimate?

Overestimate. 5 x $2 = $10. He needs about $10.

Gina is in a charity fun run. She is in the seventh row. Altogether there are 15 rows with 14 runners in each row. How many runners are in the rows behind her?

112 runners

The first 6 pages of Matt’s album are filled with baseball cards. The last 7 pages are filled with basketball cards. There are 3 blank pages in the middle. Each page can hold 4 sports cards. How many cards can the album hold in all? You can draw a picture to help.

64 cards

Estimate the product. 56 x 22

1,200

Estimate the product. 49 x 63

3,000

Estimate the product. 376 x 78

32,000

Estimate the product. 298 x 66

21,000

Estimate the product. 345 x 28

9,000

64 x 20

1,280

85 x 50

4,250

32 x 53

1,696

65 x 34

2,210

46 x 85

3,910

$20.95 x 12

$251.40

$15.05 x 19

$285.95

$2.10 x 24

$50.40

$17.35 x 42

$728.70

$99.75 x 28

$

1,438 x 12

17,256

5,422 x 42

227,724

3,683 x 14

51,562

2,000 x 41

82,000

2,485 x 19

47,215